  #main{
            width: 100%;
            height: 300px;
          /*  margin: 100px auto;
            position: relative; */
        
        }
        #main .scollimg{
            width: 100%;
            height: 300x;
           position: relative; 
		   border: 1px solid #FFFF00;
        }
        #main .scollimg img{
            position: absolute;
            top: 0;
            left: 0;
        }
        #main .btn{
            width: 730px;
            height: 220px;
            position: absolute;
            top:117px;
            left: 0;
        }
        #main .btn>div{
            width: 100px;
            height: 220px;
            background: #fff;
            opacity: 0;
        }
        #main .btn：hover>div{
            opacity: 0.35;
        }
        #main .btn #btnleft{
            position: absolute;
            top: 0;
            left: 0;
        }
        #main .btn #btnright{
            position: absolute;
            top: 0;
            right:0;
        }
        /*左右button里的三角形*/
        .triangle{
             margin-top: 50px;
            width: 0;
            height: 0;
            border-width:70px 40px;
            border-style: solid;
        }

        #main .btn #btnleft .triangle{
            border-color: transparent #ccc transparent  transparent;
        }
        #main .btn #btnright .triangle{
            margin-left: 20px;
            border-color: transparent transparent transparent #ccc;
        }
        #main .item{
            position: absolute;
            bottom: 30px;
            left: 70px;
            width: 200px;
            height: 16px;
        }
        #main .item span{
            width: 16px;
            height: 16px;
            background: #ccc;
            display: inline-block;
            border-radius: 50%;
        }
        #main .item span:hover{
            cursor: pointer;
        }